21+6a=-12+3a

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Solution for 21+6a=-12+3a equation:


Simplifying
21 + 6a = -12 + 3a

Solving
21 + 6a = -12 + 3a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-3a' to each side of the equation.
21 + 6a + -3a = -12 + 3a + -3a

Combine like terms: 6a + -3a = 3a
21 + 3a = -12 + 3a + -3a

Combine like terms: 3a + -3a = 0
21 + 3a = -12 + 0
21 + 3a = -12

Add '-21' to each side of the equation.
21 + -21 + 3a = -12 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = -12 + -21
3a = -12 + -21

Combine like terms: -12 + -21 = -33
3a = -33

Divide each side by '3'.
a = -11

Simplifying
a = -11

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